15699970665 has 32 divisors (see below), whose sum is σ = 27918835200. Its totient is φ = 8370984960.

The previous prime is 15699970651. The next prime is 15699970681. The reversal of 15699970665 is 56607999651.

15699970665 is a `hidden beast` number, since 1 + 569 + 9 + 9 + 7 + 0 + 6 + 65 = 666.

It is not a de Polignac number, because 15699970665 - 2¹⁶ = 15699905129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 540841 + ... + 569129.

It is an arithmetic number, because the mean of its divisors is an integer number (872463600).

Almost surely, 2^15699970665 is an apocalyptic number.

15699970665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15699970665 is a deficient number, since it is larger than the sum of its proper divisors (12218864535).

15699970665 is a wasteful number, since it uses less digits than its factorization.

15699970665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32414 (or 32408 counting only the distinct ones).

The product of its (nonzero) digits is 27556200, while the sum is 63.

The spelling of 15699970665 in words is "fifteen billion, six hundred ninety-nine million, nine hundred seventy thousand, six hundred sixty-five".